The summary is:
The video is about how to install an aftermarket exhaust system on a Mustang using common hand tools and some tricks to make the process easier. The video also compares the sound and performance of the stock and aftermarket exhausts using a dyno. The aftermarket exhaust sounds much better and adds 10 horsepower and 15 foot-pounds of torque to the car. The video ends with a teaser for the next video, which will involve installing a high-performance intake.
Here are some key facts extracted from the text:
1. The text is a transcript of a video tutorial on how to install an aftermarket exhaust system on a Mustang.
2. The video shows the process of removing the stock exhaust, which has six catalytic converters, an H-pipe and two mufflers, and replacing it with a new exhaust, which has two high-flow cats, an X-pipe and two straight-through mufflers.
3. The video also shows the before and after sound of the exhaust, as well as the before and after dyno results to measure the power output of the engine.
4. The video demonstrates some tips and tricks to make the installation easier, such as using penetrating fluid, heat, anti-seize, soapy water, a jack and an impact gun.
5. The video claims that the new exhaust system improved the sound and performance of the car, increasing the torque by 15 foot-pounds and the horsepower by 10. However, it also suggests that there is still a restriction in the intake that limits the power at higher RPMs.